2008 Ford Escape Hybrid No Crank no start: My FEH 2008 will not start. Dealer says i need to replace the HEV b...

My FEH 2008 will not start. Dealer says i need to replace the HEV battery. It only has 156 k on it. I run the Engineering Test mode and i got a E023 and E511 ECS code. Does anyone know what this code supposed to mean?